I will be watching my son's dog for a couple months this summer. It's a mutt he brought back from Bulgaria last summer when he was on an archeological dig. The dog is about 60 lbs, and relatively well trained, however, I'm not too sure how well it will come to me. Also, I live in the country, so if it gets out I want to be able to find it (GPS) need some suggestions for a collar that has GPS Tracking but hopefully won't break the bank. Thanks in advance!